<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - 3.18: i855GM KMS regression" href="https://bugs.freedesktop.org/show_bug.cgi?id=87171#c12">Comment # 12</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - 3.18: i855GM KMS regression" href="https://bugs.freedesktop.org/show_bug.cgi?id=87171">bug 87171</a> from <a class="email" href="mailto:bonbons67@internet.lu" title="Bruno <bonbons67@internet.lu>"> Bruno</a> <pre>The VGACNTRL value as saved early on: 0x6104008e That has both VGA_2X_MODE and VGA_PIPE_B_SELECT bits set (plus a whole bunch of bits on the less significant bytes). With patch 69769f9a422bfc62e17399da3590c5e31ac37f24 included VGACNTRL would be set to 0xe104008e. If I mask VGA_2X_MODE I get proper output on my 1440x1050 LVDS display. Thus the following patch on top of 3.18 fixes the issue for me (as an alternative to reverting commit 69769f9a42): diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 9cb5c95..fc4e16d 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -12937,7 +12937,7 @@ static void i915_disable_vga(struct drm_device *dev) * Fujitsu-Siemens Lifebook S6010 (830) has problems resuming * from S3 without preserving (some of?) the other bits. */ - I915_WRITE(vga_reg, dev_priv->bios_vgacntr | VGA_DISP_DISABLE); + I915_WRITE(vga_reg, (dev_priv->bios_vgacntr | VGA_DISP_DISABLE) & + ~VGA_2X_MODE); POSTING_READ(vga_reg); }</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>