Hi all
After upgrading my Ubuntu from 10.04 to 14.04 I only see the upper left detail of the whole screen.
In the Xorg log file (see attachment) I found that the mode was probed to 1024x768 instead of 640x480.
Then I found a suspicious error message from the kernel that could be the cause of the failed mode setting.
[ 15.312375] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in base.adjusted_mode.crtc_hdisplay (expected 0, found 4096) [ 15.312378] ------------[ cut here ]------------ [ 15.312469] WARNING: CPU: 0 PID: 31 at /build/linux-lts-wily-tX9IYW/linux-lts-wily-4.2.0/drivers/gpu/drm/i915/intel_display.c:12328 check_crtc_state+0x28c/0x420 [i915]() [ 15.312471] pipe state doesn't match! [ 15.312534] Modules linked in: snd_ca0106 snd_ac97_codec ac97_bus snd_pcm i915 snd_seq_midi gpio_ich video snd_seq_midi_event drm_kms_helper snd_rawmidi snd_seq drm coretemp snd_seq_device snd_timer serio_raw snd input_leds lpc_ich rfcomm soundcore bnep bluetooth cdc_acm i2c_algo_bit shpchp 8250_fintek parport_pc mac_hid ppdev tpm_infineon lp parport hid_generic usbhid hid psmouse pata_acpi e1000e ptp pps_core [ 15.312542] CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted 4.2.0-27-generic #32~14.04.1-Ubuntu [ 15.312545] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080015 09/08/2010 [ 15.312565] Workqueue: events output_poll_execute [drm_kms_helper] [ 15.312578] 00000000 00000000 f4f2da80 c170aa8c f4f2dac0 f4f2dab0 c1066a87 f8af69f6 [ 15.312589] f4f2dadc 0000001f f8ae8c10 00003028 f8a81dec f8a81dec f600f5f8 ef44e000 [ 15.312600] f600f5f4 f4f2dac8 c1066af3 00000009 f4f2dac0 f8af69f6 f4f2dadc f4f2ddc0 [ 15.312602] Call Trace: [ 15.312614] [<c170aa8c>] dump_stack+0x41/0x52 [ 15.312623] [<c1066a87>] warn_slowpath_common+0x87/0xc0 [ 15.312714] [<f8a81dec>] ? check_crtc_state+0x28c/0x420 [i915] [ 15.312802] [<f8a81dec>] ? check_crtc_state+0x28c/0x420 [i915] [ 15.312809] [<c1066af3>] warn_slowpath_fmt+0x33/0x40 [ 15.312902] [<f8a81dec>] check_crtc_state+0x28c/0x420 [i915] [ 15.313010] [<f8a94b39>] intel_modeset_check_state+0x269/0x6a0 [i915] [ 15.313105] [<f8a95b86>] intel_crtc_set_config+0x3b6/0x570 [i915] [ 15.313117] [<c170f317>] ? __ww_mutex_lock+0x17/0x82 [ 15.313160] [<f887b67e>] drm_mode_set_config_internal+0x4e/0xc0 [drm] [ 15.313181] [<f87d42f7>] restore_fbdev_mode+0xc7/0xf0 [drm_kms_helper] [ 15.313224] [<f8889b23>] ? __drm_modeset_lock_all+0xe3/0x110 [drm] [ 15.313245] [<f87d5efe>] drm_fb_helper_restore_fbdev_mode_unlocked+0x1e/0x50 [drm_kms_helper] [ 15.313263] [<f87d5f5c>] drm_fb_helper_set_par+0x2c/0x50 [drm_kms_helper] [ 15.313281] [<f87d5e91>] drm_fb_helper_hotplug_event+0x81/0xd0 [drm_kms_helper] [ 15.313379] [<f8aa36ba>] intel_fbdev_output_poll_changed+0x1a/0x20 [i915] [ 15.313399] [<f87cb311>] drm_kms_helper_hotplug_event+0x21/0x30 [drm_kms_helper] [ 15.313415] [<f87cb3e6>] output_poll_execute+0x66/0x170 [drm_kms_helper] [ 15.313425] [<c107c67a>] process_one_work+0x11a/0x360 [ 15.313432] [<c107cc5d>] worker_thread+0xed/0x430 [ 15.313438] [<c107cb70>] ? rescuer_thread+0x2b0/0x2b0 [ 15.313445] [<c1081391>] kthread+0xa1/0xc0 [ 15.313453] [<c1711041>] ret_from_kernel_thread+0x21/0x30 [ 15.313459] [<c10812f0>] ? kthread_create_on_node+0x140/0x140 [ 15.313465] ---[ end trace 686856814ac8c6af ]--- [ 15.412266] ------------[ cut here ]------------ [ 15.412312] WARNING: CPU: 0 PID: 31 at /build/linux-lts-wily-tX9IYW/linux-lts-wily-4.2.0/drivers/gpu/drm/drm_irq.c:1171 drm_wait_one_vblank+0x117/0x150 [drm]() [ 15.412314] vblank wait timed out on crtc 1 [ 15.412373] Modules linked in: snd_ca0106 snd_ac97_codec ac97_bus snd_pcm i915 snd_seq_midi gpio_ich video snd_seq_midi_event drm_kms_helper snd_rawmidi snd_seq drm coretemp snd_seq_device snd_timer serio_raw snd input_leds lpc_ich rfcomm soundcore bnep bluetooth cdc_acm i2c_algo_bit shpchp 8250_fintek parport_pc mac_hid ppdev tpm_infineon lp parport hid_generic usbhid hid psmouse pata_acpi e1000e ptp pps_core [ 15.412381] CPU: 0 PID: 31 Comm: kworker/0:1 Tainted: G W 4.2.0-27-generic #32~14.04.1-Ubuntu [ 15.412384] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080015 09/08/2010 [ 15.412403] Workqueue: events output_poll_execute [drm_kms_helper] [ 15.412415] 00000000 00000000 f4f2dce8 c170aa8c f4f2dd28 f4f2dd18 c1066a87 f889b194 [ 15.412426] f4f2dd44 0000001f f889ad44 00000493 f8873097 f8873097 00000000 f600f400 [ 15.412436] 00000001 f4f2dd30 c1066af3 00000009 f4f2dd28 f889b194 f4f2dd44 f4f2dd74 [ 15.412438] Call Trace: [ 15.412450] [<c170aa8c>] dump_stack+0x41/0x52 [ 15.412459] [<c1066a87>] warn_slowpath_common+0x87/0xc0 [ 15.412496] [<f8873097>] ? drm_wait_one_vblank+0x117/0x150 [drm] [ 15.412529] [<f8873097>] ? drm_wait_one_vblank+0x117/0x150 [drm] [ 15.412536] [<c1066af3>] warn_slowpath_fmt+0x33/0x40 [ 15.412571] [<f8873097>] drm_wait_one_vblank+0x117/0x150 [drm] [ 15.412580] [<c10a0b30>] ? prepare_to_wait_event+0xd0/0xd0 [ 15.412678] [<f8a89034>] i9xx_crtc_disable+0x44/0x400 [i915] [ 15.412773] [<f8a9ad9d>] ? intel_frontbuffer_flush+0x5d/0x70 [i915] [ 15.412865] [<f8a8e9a8>] __intel_set_mode+0x228/0xa80 [i915] [ 15.412912] [<f888a0c8>] ? drm_atomic_set_crtc_for_plane+0x78/0x100 [drm] [ 15.413011] [<f8a95a6c>] intel_crtc_set_config+0x29c/0x570 [i915] [ 15.413023] [<c170f317>] ? __ww_mutex_lock+0x17/0x82 [ 15.413064] [<f887b67e>] drm_mode_set_config_internal+0x4e/0xc0 [drm] [ 15.413085] [<f87d42f7>] restore_fbdev_mode+0xc7/0xf0 [drm_kms_helper] [ 15.413131] [<f8889b23>] ? __drm_modeset_lock_all+0xe3/0x110 [drm] [ 15.413152] [<f87d5efe>] drm_fb_helper_restore_fbdev_mode_unlocked+0x1e/0x50 [drm_kms_helper] [ 15.413171] [<f87d5f5c>] drm_fb_helper_set_par+0x2c/0x50 [drm_kms_helper] [ 15.413190] [<f87d5e91>] drm_fb_helper_hotplug_event+0x81/0xd0 [drm_kms_helper] [ 15.413293] [<f8aa36ba>] intel_fbdev_output_poll_changed+0x1a/0x20 [i915] [ 15.413311] [<f87cb311>] drm_kms_helper_hotplug_event+0x21/0x30 [drm_kms_helper] [ 15.413325] [<f87cb3e6>] output_poll_execute+0x66/0x170 [drm_kms_helper] [ 15.413335] [<c107c67a>] process_one_work+0x11a/0x360 [ 15.413342] [<c107cc5d>] worker_thread+0xed/0x430 [ 15.413348] [<c107cb70>] ? rescuer_thread+0x2b0/0x2b0 [ 15.413355] [<c1081391>] kthread+0xa1/0xc0 [ 15.413363] [<c1711041>] ret_from_kernel_thread+0x21/0x30 [ 15.413368] [<c10812f0>] ? kthread_create_on_node+0x140/0x140 [ 15.413375] ---[ end trace 686856814ac8c6b0 ]---
One finds a print of the kernel ring buffer in the attachment.
Is my assumption correct?
TIA Sebastian