X modesetting driver fails to start with cirrus KMS on QEMU/KVM since 3.19-rc.
The culprit is the commit 8975626ea35adcca561f8a81dedccfbc5dd8ec72
drm/cirrus: allow 32bpp framebuffers for cirrus drm
Reverting this commit makes X working again.
X modesetting driver seems to try to open 1024x768x32 graphics, where the pitch is 4096 and greater than max_pitch (4088) defined in cirrus_check_framebuffer().
And it doesn't fall back to 24bpp as the patch expected.
Tested with 3.19-rc7 with qemu 2.1 -vga cirrus option.
Freedesktop's Bugzilla instance is EOLed and open bugs are about to be migrated to http://gitlab.freedesktop.org.
To avoid migrating out of date bugs, I am now closing all the bugs that did not see any activity in the past year. If the issue is still happening, please create a new bug in the relevant project at https://gitlab.freedesktop.org/drm (use misc by default).
Sorry about the noise!