[Bug 59841] [IVB cpu eDP] panel is broken due to 657445fe86 (eDP bpp clamping)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=59841

--- Comment #98 from jkp <jkp at iki.fi> ---
Hmm - comparing 3.9.5 to 3.11-rc7, these have been introduced:

    /* Dell XPS13 HD Sandy Bridge */
    { 0x0116, 0x1028, 0x052e, quirk_no_pcm_pwm_enable },
    /* Dell XPS13 HD and XPS13 FHD Ivy Bridge */
    { 0x0166, 0x1028, 0x058b, quirk_no_pcm_pwm_enable },

a comment on that:

 * Some machines (Dell XPS13) suffer broken backlight controls if
 * BLM_PCH_PWM_ENABLE is set.
 */

Maybe you can try disabling that to see if it helps.

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