On Fri, May 22, 2026 at 12:26:05PM +0000, Mikolaj Kucharski wrote:
> >Synopsis: Fresh install ends up with blank screen, disabling inteldrm
> >brings console back.
> >Category: kernel
> >Environment:
> System : OpenBSD 7.9
> Details : OpenBSD 7.9-current (GENERIC.MP) #501: Thu May 21
> 19:28:37 MDT 2026
>
> [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
>
> Architecture: OpenBSD.amd64
> Machine : amd64
> >Description:
> OpenBSD fresh install, every boot with non-modified GENERIC.MP. Initial
> dmesg is visible. Blue
> background, white font progresses with boot up. The moment filesystem is
> mounted and firmware files are
> fetchable screen goes dark pitch black. System boots up as I can SSH into the
> laptop and from inside all
> seems to be good. Except no glass console.
> >How-To-Repeat:
> Fresh install of OpenBSD/amd64 on ThinkPad X1 Carbon Gen 13 Aurora
> Edition.
> >Fix:
> Unknown. Workaround is to boot -c and `disable inteldrm*`. Below are
> details fetched over SSH with
Does this diff to disable GuC submission (and low power states)
make the screen light up?
Index: sys/dev/pci/drm/i915/i915_driver.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/drm/i915/i915_driver.c,v
diff -u -p -r1.30 i915_driver.c
--- sys/dev/pci/drm/i915/i915_driver.c 30 Apr 2026 04:33:06 -0000 1.30
+++ sys/dev/pci/drm/i915/i915_driver.c 22 May 2026 14:27:18 -0000
@@ -2322,12 +2322,10 @@ inteldrm_attach(struct device *parent, s
dev_priv->display = display;
- /*
- * with GuC submission, init sometimes fails on Alder Lake-P
- * and Raptor Lake-S, too early for IS_ALDERLAKE
- */
- if (info->platform == INTEL_ALDERLAKE_P ||
- info->platform == INTEL_ALDERLAKE_S)
+ /* uc_expand_default_options() with no GuC submission */
+ if (GRAPHICS_VER(dev_priv) >= 12 &&
+ (INTEL_INFO(dev_priv)->platform != INTEL_TIGERLAKE) &&
+ (INTEL_INFO(dev_priv)->platform != INTEL_ROCKETLAKE))
dev_priv->params.enable_guc = ENABLE_GUC_LOAD_HUC;
mmio_bar = (GRAPHICS_VER(dev_priv) == 2) ? 0x14 : 0x10;
Index: sys/dev/pci/drm/i915/i915_pci.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/drm/i915/i915_pci.c,v
diff -u -p -r1.25 i915_pci.c
--- sys/dev/pci/drm/i915/i915_pci.c 9 Mar 2026 23:58:01 -0000 1.25
+++ sys/dev/pci/drm/i915/i915_pci.c 22 May 2026 14:21:40 -0000
@@ -771,7 +771,7 @@ static const struct intel_device_info mt
.has_flat_ccs = 0,
.has_gmd_id = 1,
.has_guc_deprivilege = 1,
- .has_guc_tlb_invalidation = 1,
+ .has_guc_tlb_invalidation = 0,
.has_llc = 0,
.has_mslice_steering = 0,
.has_snoop = 1,
