Flickering and blank screens at high resolution with Intel HD
by Markus Malkusch
Posted on Wednesday Sep 24, 2014 at 07:40PM in Technology
My Lenovo T410s' graphic chip (Intel HD) produces under some circumstances annoying flickering and blank screens. Those circumstances apears to be a high resolution (in my case 2560x1440 pixel at my Dell U2711 via DisplayPort).
The kernel log might show something like this:
WARNING: CPU: 0 PID: 1815 at drivers/gpu/drm/i915/intel_display.c:953 ironlake_crtc_disable+0x86/0x816() pipe_off wait timed out … Call Trace: dump_stack+0x49/0x6a warn_slowpath_common+0x78/0x90 ironlake_crtc_disable+0x86/0x816 warn_slowpath_fmt+0x45/0x4a ironlake_crtc_disable+0x86/0x816 __intel_set_mode+0xbfe/0x11d4 intel_set_mode+0xd/0x27 intel_crtc_set_config+0x70e/0xa13 drm_mode_set_config_internal+0x48/0xad restore_fbdev_mode+0x8f/0xa8 drm_fb_helper_restore_fbdev_mode_unlocked+0x1d/0x34 get_vtime_delta+0xd/0x59 drm_fb_helper_set_par+0x3a/0x58 fb_set_var+0x246/0x32c finish_task_switch+0x44/0xd2 __schedule+0x5cb/0x755 fbcon_blank+0x71/0x230 do_unblank_screen+0xe1/0x15b complete_change_console+0x4b/0xb6 vt_ioctl+0x915/0xf83 tty_ioctl+0x8f1/0x960 vtime_user_enter+0x23/0x3e syscall_trace_leave+0x185/0x190 do_vfs_ioctl+0x3f3/0x43c __fget+0x64/0x6c SyS_ioctl+0x33/0x59 tracesys+0xe1/0xe6 --[ end trace 0a29c17dff6acf50 ]--- [drm:ibx_irq_handler] *ERROR* PCH transcoder B FIFO underrun
I found someone with the newer graphic chip HD 4000 whose problems sound very familiar to mine. Fortunately Intel is giving hints to identify the problem, a workaround and a solution:
This issue is a BIOS issue specifically with the Memory Reference Code (MRC) version 22.214.171.124 or older. Please contact your system or motherboard manufacturer for a system BIOS update for your system or motherboard that includes MRC 126.96.36.199 or newer. If you have a system with 2 or more memory modules and are comfortable with removing all but one of them so that your memory is in single channel mode, try and remove all but one of them and the issue will go away. This can be used as a workaround until you are able to update your system BIOS from your system or motherboard manufacturer that includes MRC 188.8.131.52 or newer.
Running the system with one RAM module is a nice start to identify the problem. After that let's replace the old T410s BIOS 1.47 with the latest version 1.50 and see how the system performs with two RAM modules.
Bingo! The system runs now for more than one day without flickering or blank screen. But unfortunately it's not fixed completely: Waking up from hibernation brings you back into flickering land!