On 07.07.2014 17:04, Daniel Vetter wrote:
On Sat, Jun 21, 2014 at 01:57:32PM +0200, Thomas Richter wrote:
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.
Should be unrelated - more likely it's some fumble in the modeset
sequence, i945 is known to be picky in that area. Just to confirm: Latest
3.16-rc kernels are still broken?
At least 3.16-rc from one and a half week ago is affected, too. I'm
currently not in reach of the machine - actually almost as far appart as
possible.
Can you please boot with drm.debug=0xe and grab a new dmesg with the
backtrace?
I'll try next week. What do you mean by "backtrace" apart from
drm.debug=0x0e?
As soon as X is initialized, graphics work again, I just don't have a boot
console.
So once X is running fbcon also works again, i.e. it's only the initial
boot console that's black?
Exactly. Once X is up, the console is fine again, too.
Greetings from Sapporo (<- which explains my unavailability),
Thomas
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