KMS modeset results in a blank screen. Except for the screen everything else is functional.
Seeing this on linux-2.6.34-gentoo-r1 and ThinkPad X201i
Steps to Reproduce:
1. Enable KMS modsetting on linux-2.6.34-gentoo-r1 on X200, X201 etc
Black screen, all other devices are functional
Kernel linux-2.6.32-gentoo-r7 didn't have that problem.
This issue is coming from Vanilla.
The last working vanilla was 18.104.22.168.
The issue started to reproduce with kernel 2.6.33 and is still present in the current stable 2.6.34.
The patch to 2.6.34 is proposed in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554569 or some other place linked from there.
The patch doesn't work for me.
This issue doesn't seem to be a duplicate of http://bugs.gentoo.org/show_bug.cgi?id=313915
The main point of this bug: please don't release a new stable kernel before a good patch is produced for the mainline, or some other resolution becomes available at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554569
The number of X2xxx ThinkPad users is significant.
The point is, we do our best to solve bugs before we stabilize a kernel, but we cannot anticipate any bugs that appear after a stable request, nor can we expect to have zero bugs. We make sure wide ranging bugs don't exist as well as critical security bugs.
Ok, I was making my previous statement not being aware of gentoo-sources-2.6.33-r2 being stabilized at the very same moment :)
My concern was 2.6.34 and I was asking devs to keep an eye on the blank screen bug.
Kernels prior to 2.6.34 have another issue with USB not functional after suspend/resume (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/566149). Not sure if it is worth filing here though.
Sorry once again - that patch to 2.6.34 actually worked for me.
Help me out so I am clear.
Bug is on 2.6.33 and 2.6.34. Is this the patch that fixes the issue for both versions?
You can open a separate buug for the usb problem if you like.
(In reply to comment #5)
> Help me out so I am clear.
> Bug is on 2.6.33 and 2.6.34. Is this the patch that fixes the issue for both
> You can open a separate buug for the usb problem if you like.
No bug still reproducable on my Thinkpad X201
With patch kms fb console became filled with rainbow stripes
as i alredy reported on freedesktop bug
patch works with additional kernel command line parameter intel_iommu=igfx_off
This will be in the next release of gentoo-sources-2.6.34
Released in gentoo-sources-2.6.34-r3