<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [i915GM regression] black screen after blank when LID is closed on Linux >= 3.1" href="https://bugs.freedesktop.org/show_bug.cgi?id=57434#c11">Comment # 11</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [i915GM regression] black screen after blank when LID is closed on Linux >= 3.1" href="https://bugs.freedesktop.org/show_bug.cgi?id=57434">bug 57434</a> from <a class="email" href="mailto:krzysiek@podlesie.net" title="Krzysztof Mazur <krzysiek@podlesie.net>"> Krzysztof Mazur</a> <pre>I found a way to bring display back after this problem, I just need to set a VGACNTRL register: writel(0x80000000, 0xd0471400) 0xd0400000 is I915GM BAR0. 00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company NX6110/NC6120 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at d0400000 (32-bit, non-prefetchable) [size=512K] I/O ports at 7000 [size=8] Memory at c0000000 (32-bit, prefetchable) [size=256M] Memory at d0480000 (32-bit, non-prefetchable) [size=256K] I found that by reenabling ACPI video, but with different DOS settings: diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index ae9deca..491751b 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -1457,7 +1457,7 @@ static int acpi_video_bus_put_devices(struct acpi_video_bus *video) static int acpi_video_bus_start_devices(struct acpi_video_bus *video) { - return acpi_video_bus_DOS(video, 0, 0); + return acpi_video_bus_DOS(video, 3, 1); } static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) In that case the single LID close + LID open triggers the issue and intel_reg_dumper diff is much cleaner in that case. --- before.dump 2012-12-18 22:21:32.000000000 +0100 +++ after.dump 2012-12-18 22:21:47.000000000 +0100 @@ -37,7 +37,7 @@ DVOA_SRCDIM: 0x00000000 DVOB_SRCDIM: 0x00000000 DVOC_SRCDIM: 0x00000000 - PP_CONTROL: 0xabcd0001 (power target: on) + PP_CONTROL: 0x00000001 (power target: on) PP_STATUS: 0xc0000008 (on, ready, sequencing idle) PP_ON_DELAYS: 0x025807d0 PP_OFF_DELAYS: 0x01f407d0 @@ -55,7 +55,7 @@ DSPATILEOFF: 0x00000000 PIPEACONF: 0xc0000000 (enabled, double-wide) PIPEASRC: 0x077f059f (1920, 1440) - PIPEASTAT: 0x00000203 (status: VSYNC_INT_STATUS VBLANK_INT_STATUS OREG_UPDATE_STATUS) + PIPEASTAT: 0x80000203 (status: FIFO_UNDERRUN VSYNC_INT_STATUS VBLANK_INT_STATUS OREG_UPDATE_STATUS) PIPEA_GMCH_DATA_M: 0x00000000 PIPEA_GMCH_DATA_N: 0x00000000 PIPEA_DP_LINK_M: 0x00000000 @@ -107,8 +107,8 @@ VCLK_DIVISOR_VGA0: 0x00031108 VCLK_DIVISOR_VGA1: 0x00031406 VCLK_POST_DIV: 0x00800080 - VGACNTRL: 0x80000000 (disabled) - TV_CTL: 0x000c0c00 + VGACNTRL: 0x22c40000 (enabled) + TV_CTL: 0x300c0c00 TV_DAC: 0x70000000 TV_CSC_Y: 0x0332012d TV_CSC_Y2: 0x07d30104</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>