I can confirm that the following patch solves the bug for me (X201, latest bios
version 1.14, patch applied to the offical 10.04 kernel 2.6.32-22)
+++ intel_display.c
bool found;
/* approximately equals target * 0.00488 */
int err_most = (target >> 8) + (target >> 10);
+ err_most += 50;
found = false;
if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
--
[lucid] Blank screen with KMS on Thinkpad X201 with Arrandale (i915)
https://bugs.launchpad.net/bugs/554569
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