I've encountered an issue with the DRM driver on the 3.8.13 kernel
that others might have had before and I'm looking to track down. I
wanted to get the info out on the list as I try to track this down. I
think I'm seeing something similar on the 3.12 kernel as well.
In particular, I get the below error, but there are errors earlier in
the log as well.
[ 6.150786] ------------[ cut here ]------------
[ 6.150799] WARNING: at drivers/gpu/drm/tilcdc/tilcdc_crtc.c:251
tilcdc_crtc_mode_set+0x3b/0x468()
[ 6.150803] Modules linked in:
[ 6.150820] [<c0010569>] (unwind_backtrace+0x1/0x8c) from
[<c002b713>] (warn_slowpath_common+0x33/0x48)
[ 6.150830] [<c002b713>] (warn_slowpath_common+0x33/0x48) from
[<c002b737>] (warn_slowpath_null+0xf/0x10)
[ 6.150843] [<c002b737>] (warn_slowpath_null+0xf/0x10) from
[<c01effcf>] (tilcdc_crtc_mode_set+0x3b/0x468)
[ 6.150858] [<c01effcf>] (tilcdc_crtc_mode_set+0x3b/0x468) from
[<c01e0481>] (drm_crtc_helper_set_mode+0x147/0x22e)
[ 6.150872] [<c01e0481>] (drm_crtc_helper_set_mode+0x147/0x22e)
from [<c01e0a2b>] (drm_crtc_helper_set_config+0x423/0x5e8)
[ 6.150886] [<c01e0a2b>] (drm_crtc_helper_set_config+0x423/0x5e8)
from [<c01df101>] (drm_fb_helper_pan_display+0x3f/0x60)
[ 6.150899] [<c01df101>] (drm_fb_helper_pan_display+0x3f/0x60) from
[<c01abaff>] (fb_pan_display+0x8b/0xba)
[ 6.150914] [<c01abaff>] (fb_pan_display+0x8b/0xba) from
[<c01b3e95>] (bit_update_start+0x11/0x22)
[ 6.150927] [<c01b3e95>] (bit_update_start+0x11/0x22) from
[<c01b27ff>] (fbcon_switch+0x2f3/0x2fa)
[ 6.150939] [<c01b27ff>] (fbcon_switch+0x2f3/0x2fa) from
[<c01d1409>] (redraw_screen+0xab/0x156)
[ 6.150951] [<c01d1409>] (redraw_screen+0xab/0x156) from
[<c01b2057>] (fbcon_blank+0x117/0x184)
[ 6.150963] [<c01b2057>] (fbcon_blank+0x117/0x184) from
[<c01d1d2f>] (do_unblank_screen+0x97/0x104)
[ 6.150976] [<c01d1d2f>] (do_unblank_screen+0x97/0x104) from
[<c01cbd9f>] (vt_ioctl+0x357/0xcf8)
[ 6.150991] [<c01cbd9f>] (vt_ioctl+0x357/0xcf8) from [<c01c6931>]
(tty_ioctl+0x763/0x7a6)
[ 6.151002] [<c01c6931>] (tty_ioctl+0x763/0x7a6) from [<c009dead>]
(vfs_ioctl+0x15/0x20)
[ 6.151013] [<c009dead>] (vfs_ioctl+0x15/0x20) from [<c009e64b>]
(do_vfs_ioctl+0x3ad/0x3e2)
[ 6.151023] [<c009e64b>] (do_vfs_ioctl+0x3ad/0x3e2) from
[<c009e6b1>] (sys_ioctl+0x31/0x4c)
[ 6.151033] [<c009e6b1>] (sys_ioctl+0x31/0x4c) from [<c000c681>]
(ret_fast_syscall+0x1/0x46)
[ 6.151038] ---[ end trace a4cfba2762605997 ]---
[ 6.151050] [drm:drm_crtc_helper_set_config] *ERROR* failed to set
mode on [CRTC:3]