Public bug reported: 3D acceleration doesn't seem to work on the PAE kernel (which Ubuntu has made the default in my grub menu). The screen goes black (signal lost) after leaving grub, and only comes back with the login menu. If I use the non-PAE kernel, same version and everything, it seems to work. I've provided snippets of dmesg and xorg logs of both. Significant differences, I've noticed:
PAE Xorg.0.log: [ 25.741] (II) RADEON(0): GPU accel disabled or not working, using shadowfb for KMS [ 25.750] (II) RADEON(0): KMS Color Tiling: disabled PAE: [ 25.741] (II) RADEON(0): GPU accel disabled or not working, using shadowfb for KMS PAE: [ 26.682] (II) RADEON(0): mem size init: gart size :1fdff000 vram size: s:40000000 visible:f7d7000 non-PAE: [ 22.066] (II) RADEON(0): mem size init: gart size :1fdff000 vram size: s:40000000 visible:3f7d7000 (an extra digit included?) and PAE dmesg: [ 2.046120] [drm] Loading RS690/RS740 Microcode [ 2.057778] [drm] radeon: ring at 0x0000000060001000 [ 2.194499] [drm:r100_ring_test] *ERROR* radeon: ring test failed (scratch(0x15E4)=0xCAFEDEAD) [ 2.194502] [drm:r100_cp_init] *ERROR* radeon: cp isn't working (-22). [ 2.194506] radeon 0000:01:05.0: failed initializing CP (-22). [ 2.194508] radeon 0000:01:05.0: Disabling GPU acceleration [ 2.318118] [drm:r100_cp_fini] *ERROR* Wait for CP idle timeout, shutting down CP. [ 2.440936] Failed to wait GUI idle while programming pipes. Bad things might happen. [ 2.441053] [drm] radeon: cp finalized $ lsb_release -rd Description: Ubuntu 12.04 LTS Release: 12.04 $ apt-cache policy linux-image-3.2.0-24-generic-pae: linux-image-3.2.0-24-generic-pae: Installed: 3.2.0-24.38 Candidate: 3.2.0-24.38 Version table: *** 3.2.0-24.38 0 500 http://archive.ubuntu.com/ubuntu/ precise-proposed/main i386 Packages 100 /var/lib/dpkg/status 3.2.0-24.37 0 500 http://archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: radeon rs690 x1200 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/993802 Title: PAE and radeon integrated rs690 (x1200) prevents dri To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/993802/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
