[Intel-gfx] No boot console/Plane B assertion value on 945GM hardware

[Thomas Richter]

Hi Daniel, dear intel experts,

this a bug report for the intel i945GM integrated graphics chipset 
(*NOT* the 830GM this time). Since at least 3.12.0, but also with the 
latest intel-drm-nightly, I have no boot console on the 945GM chipset, 
the screen just remains blank. /var/log/messages  shows an assertion 
failure, see the attached kernel log for details, booted with 
drm.debug=0x0e.

The problem appears if the kernel is booted with the vga=792 option  - 
note that the panel in this laptop is a 1024x768 and thus this is the 
native resolution. The problem does not appear with a text console.

This sounds remarkably similar to the deadlock the 830GM had a while ago 
when booting with a graphical console, also with vga=792.

This is the kernel warning:

Jun 21 13:44:26 kahvi kernel: [    4.780120] WARNING: CPU: 1 PID: 239 at 
drivers/gpu/drm/i915/intel_display.c:1307 
assert_planes_disabled+0x110/0x160 [i915]()
Jun 21 13:44:26 kahvi kernel: [    4.780126] plane B assertion failure, 
should be off on pipe B but is still active

The machine is a Fujitsu Siemens T4215. lspci lists the following hardware:

00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML 
and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 
943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 
943/940GML Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition 
Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 
1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 
2 (rev 02)
00:1c.2 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 
3 (rev 02)
00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI 
Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI 
Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI 
Controller #3 (rev 02)
00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI 
Controller #4 (rev 02)
00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI 
Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface 
Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE 
Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7-M Family) 
SATA Controller [AHCI mode] (rev 02)
00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 02)
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8055 PCI-E 
Gigabit Ethernet Controller (rev 12)
05:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or 
AGN [Kedron] Network Connection (rev 61)
08:03.0 CardBus bridge: O2 Micro, Inc. OZ711MP1/MS1 MemoryCardBus 
Controller (rev 20)
08:03.1 CardBus bridge: O2 Micro, Inc. OZ711MP1/MS1 MemoryCardBus 
Controller (rev 20)
08:03.2 SD Host controller: O2 Micro, Inc. Integrated MMC/SD Controller
08:03.3 Bridge: O2 Micro, Inc. Integrated MS/xD Controller

As soon as X is initialized, graphics work again, I just don't have a 
boot console.

Thanks,
	Thomas
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