Any #Linux users on #IntelArc here?
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Any #Linux users on #IntelArc here?
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Any #Linux users on #IntelArc here?

I bought an Intel Arc A750 and it looks fancy, works for gaming and AV1 encoding (after adding “vpl-gpu-rt” recompiling the kernel for that I guess), but I cannot control the fan at all!

The fan mode is “automatic” and on full power all the time which is crazy loud.

I tried everything, updated my kernel to 6.18 longterm, used a windows install to use that intel tool to upgrade the GPU firmware, no change.

Now I plan on connecting the fan to the case fan connector and controlling it through BIOS (I can read temperature now so that is okay-ish I guess).

I couldn’t find a single report of this being a thing at all, do these GPUs really have THAT shitty drivers? I thought it was just performance issues (which I didnt really see).

Discourse Thread:

https://discourse.nixos.org/t/76041

@[email protected] @pcmasterrace @[email protected] @buildapc @[email protected] @[email protected] @intel_arc #PcBuilding #GraphicsCard #NixOS

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9•15d

What’s with all the hashtags?

boredsquirrel
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6•15d

@hddsx

Fedi thing outside of lemmy and I never got crossposting on Lemmy to work

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27•
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15d

It’s probably coming from Mastodon

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3•
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14d

I know you probably meant the hashtags are coming from Mastodon rather than the person, but I still chuckled at the thought of you casually considering a Mastodon user so lowly that you call them an ‘it’.

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3•
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14d

The message*

But now that you say it I can see what you mean yeah. That wasn’t my goal and op is most probably a normal human being although I can’t vouch for the normal part.

I’ll use the “not native speaker joker card” and add some French slurs as punctuation, putain :)

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2•14d

Ah! Je comprend “https://jlai.lu/” maintenant, c’est comme reddit!

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2•14d

Ouaip ! Je l’ai lu, jlailu. On est assez fiers de notre nom de domaine, on essaie d’être de “feddit” de la francophonie.

Mark with a Z
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11•15d

You can always tell who’s posting from a twitter type platform by their piles of hashtags and mentions

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1•15d

I don’t have a nixos account so I’m just replying here.

I run an A770 LE on Debian Testing and most things seemed to work out of the box. I also contributed ARC support into nvtop, so I can explain some of the values from sensors.

  • fan speed still max and no reporting

Not sure, maybe the fan become slightly unplugged, does it work in Windows? I know the fans on some sparkle cards have a different number of pulses per rotation that can screw with the readings, but it shouldn’t be 0.

  • no voltage or power usage shown

Voltage only sometimes works for me and I’m not sure what it correlates to. But the power usage is shown, it just shows it in kilojoules since the card got power, not in watts. See this comment I made for a conversion.

Just fan control…

AFAIK, there’s nothing you can do.

I do have a patch somewhere that can display VRAM temperature if you’d like to try it and nixos has a good way of applying patches.

boredsquirrel
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14d

@SteveTech

Amazing! I also tried it on windows, with all the official vendor malware installed, and the fan reported speed 0 and ran on max too!

So I am kinda ruling out Linux issues, and need to go deeper.

I upgraded the firmware of the GPU already, no change.

The PC is rather old, 7th Gen i7, officially doesn’t support the GPU. The BIOS is pretty outdated too.

Might it be that?

I also looked at the 2 fan cables, they seem fine but I will see what happens if I plug them out and in again, or plug the secondary one out first.

Previous owner said the cards ran silent, and the case is very closed so I doubt something moved in shipping

I already run the nvtopPackages.intel and it displays more than sensors I think. The VRAM temperature fix sounds fun but I think there is no need right now. I should learn how to build “derivations” which is how you apply patches declaratively afaik.

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14d

The PC is rather old, 7th Gen i7, officially doesn’t support the GPU. The BIOS is pretty outdated too.

That shouldn’t effect fan speeds, it’ll give you some performance issues, especially if you don’t have Resizeable BAR enabled, but I don’t see how it could effect any of the sensors.

Previous owner said the cards ran silent, and the case is very closed so I doubt something moved in shipping

Hmm, I’ve heard some crazy stories about shipping. Was the GPU reinforced by foam or something? Otherwise it will shake about.

I already run the nvtopPackages.intel and it displays more than sensors I think.

Perfect!

The VRAM temperature fix sounds fun but I think there is no need right now. I should learn how to build “derivations” which is how you apply patches declaratively afaik.

Edit: Just realised Mastodon really screws up code blocks, view the patch from Lemmy.

Patch 
From 26cc3d3444564abb2650ad76957dbb3aac3cf1f8 Mon Sep 17 00:00:00 2001
From: Stephen Horvath <[email protected]>
Date: Sun, 29 Jun 2025 11:50:53 +1000
Subject: [PATCH] drm/i915/hwmon: Expose VRAM Temperature
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This patch adds the VRAM temperature to the i915 hwmon driver. The
temperature is exposed through the temp2_input sysfs attribute.

$ sensors
i915-pci-0300
Adapter: PCI adapter
in0: 663.00 mV
fan1: 746 RPM
temp1: +49.0°C
temp2: +52.0°C
power1: N/A  (max = 190.00 W, rated max =   0.00 W)
energy1: 25.04 kJ

Signed-off-by: Stephen Horvath <[email protected]>
---
 drivers/gpu/drm/i915/i915_hwmon.c        | 41 ++++++++++++++++--------
 drivers/gpu/drm/i915/intel_mchbar_regs.h |  2 ++
 2 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c
index 7dfe1784153f..7d04b6221f4b 100644
--- a/drivers/gpu/drm/i915/i915_hwmon.c
+++ b/drivers/gpu/drm/i915/i915_hwmon.c
@@ -40,6 +40,7 @@ struct hwm_reg {
 	i915_reg_t energy_status_all;
 	i915_reg_t energy_status_tile;
 	i915_reg_t fan_speed;
+	i915_reg_t vram_temp;
 };
 
 struct hwm_energy_info {
@@ -282,7 +283,7 @@ static const struct attribute_group *hwm_groups[] = {
 };
 
 static const struct hwmon_channel_info * const hwm_info[] = {
-	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
+	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT, HWMON_T_INPUT),
 	HWMON_CHANNEL_INFO(in, HWMON_I_INPUT),
 	HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX | HWMON_P_CRIT),
 	HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT),
@@ -314,34 +315,46 @@ static int hwm_pcode_write_i1(struct drm_i915_private *i915, u32 uval)
 }
 
 static umode_t
-hwm_temp_is_visible(const struct hwm_drvdata *ddat, u32 attr)
+hwm_temp_is_visible(const struct hwm_drvdata *ddat, u32 attr, int chan)
 {
 	struct i915_hwmon *hwmon = ddat->hwmon;
 
-	if (attr == hwmon_temp_input && i915_mmio_reg_valid(hwmon->rg.pkg_temp))
+	if (attr == hwmon_temp_input && chan == 0 &&
+		i915_mmio_reg_valid(hwmon->rg.pkg_temp))
+		return 0444;
+
+	if (attr == hwmon_temp_input && chan == 1 &&
+		i915_mmio_reg_valid(hwmon->rg.vram_temp))
 		return 0444;
 
 	return 0;
 }
 
 static int
-hwm_temp_read(struct hwm_drvdata *ddat, u32 attr, long *val)
+hwm_temp_read(struct hwm_drvdata *ddat, u32 attr, int chan, long *val)
 {
 	struct i915_hwmon *hwmon = ddat->hwmon;
 	intel_wakeref_t wakeref;
 	u32 reg_val;
 
-	switch (attr) {
-	case hwmon_temp_input:
+	if (attr != hwmon_temp_input)
+		return -EOPNOTSUPP;
+
+	switch (chan) {
+	case 0:
 		with_intel_runtime_pm(ddat->uncore->rpm, wakeref)
 			reg_val = intel_uncore_read(ddat->uncore, hwmon->rg.pkg_temp);
-
-		/* HW register value is in degrees Celsius, convert to millidegrees. */
-		*val = REG_FIELD_GET(TEMP_MASK, reg_val) * MILLIDEGREE_PER_DEGREE;
-		return 0;
+		break;
+	case 1:
+		with_intel_runtime_pm(ddat->uncore->rpm, wakeref)
+			reg_val = intel_uncore_read(ddat->uncore, hwmon->rg.vram_temp);
+		break;
 	default:
-		return -EOPNOTSUPP;
+		return -EINVAL;
 	}
+	/* HW register value is in degrees Celsius, convert to millidegrees. */
+	*val = REG_FIELD_GET(TEMP_MASK, reg_val) * MILLIDEGREE_PER_DEGREE;
+	return 0;
 }
 
 static umode_t
@@ -727,7 +740,7 @@ hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type,
 
 	switch (type) {
 	case hwmon_temp:
-		return hwm_temp_is_visible(ddat, attr);
+		return hwm_temp_is_visible(ddat, attr, channel);
 	case hwmon_in:
 		return hwm_in_is_visible(ddat, attr);
 	case hwmon_power:
@@ -751,7 +764,7 @@ hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 
 	switch (type) {
 	case hwmon_temp:
-		return hwm_temp_read(ddat, attr, val);
+		return hwm_temp_read(ddat, attr, channel, val);
 	case hwmon_in:
 		return hwm_in_read(ddat, attr, val);
 	case hwmon_power:
@@ -855,6 +868,7 @@ hwm_get_preregistration_info(struct drm_i915_private *i915)
 		hwmon->rg.energy_status_all = PCU_PACKAGE_ENERGY_STATUS;
 		hwmon->rg.energy_status_tile = INVALID_MMIO_REG;
 		hwmon->rg.fan_speed = PCU_PWM_FAN_SPEED;
+		hwmon->rg.vram_temp = IS_DG2(i915) ? BMG_VRAM_TEMPERATURE : INVALID_MMIO_REG;
 	} else {
 		hwmon->rg.pkg_temp = INVALID_MMIO_REG;
 		hwmon->rg.pkg_power_sku_unit = INVALID_MMIO_REG;
@@ -863,6 +877,7 @@ hwm_get_preregistration_info(struct drm_i915_private *i915)
 		hwmon->rg.energy_status_all = INVALID_MMIO_REG;
 		hwmon->rg.energy_status_tile = INVALID_MMIO_REG;
 		hwmon->rg.fan_speed = INVALID_MMIO_REG;
+		hwmon->rg.vram_temp = INVALID_MMIO_REG;
 	}
 
 	with_intel_runtime_pm(uncore->rpm, wakeref) {
diff --git a/drivers/gpu/drm/i915/intel_mchbar_regs.h b/drivers/gpu/drm/i915/intel_mchbar_regs.h
index dc2477179c3e..94a9f4680c41 100644
--- a/drivers/gpu/drm/i915/intel_mchbar_regs.h
+++ b/drivers/gpu/drm/i915/intel_mchbar_regs.h
@@ -255,4 +255,6 @@
 
 #define BXT_GT_PERF_STATUS			_MMIO(MCHBAR_MIRROR_BASE_SNB + 0x7070)
 
+#define BMG_VRAM_TEMPERATURE			_MMIO(0x1382c0)
+
 #endif /* __INTEL_MCHBAR_REGS */
boredsquirrel
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1•14d

@SteveTech

Cool! No shipping was fine, in 2 boxes tightly packed. Yes, BIOS really shouldnt affect the fans.

I will look again if I can find anything in there

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2•13d

I’m running an Arc 750 from Asrock, and I haven’t had this problem. But here’s a list of useful tools, that might help you:

  • nvtop
  • intel_gpu_top
  • LACT

Hope it helps ;)

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2•15d

I’d find out who maintains the driver and see what kind of help they need to add or fix this functionality.

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