Hello
i915.fastboot can be made to work on the x60, shaving about 0.8s from boot (and removing the annoying blinking screen)
Since coreboot doesn't select the same video mode the kernel does, the easiest way to make that work is to comment out request for a mode change when the modes are different: in linux-3.14.25/drivers/gpu/drm/i915/intel_display.c comment out on line 9879: config->mode_changed = true; so that it looks like:
if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
DRM_DEBUG_KMS("modes are different, full mode set\n");
drm_mode_debug_printmodeline(&set->crtc->mode);
drm_mode_debug_printmodeline(set->mode);
// config->mode_changed = true;
}
It's hackish, but the results are worth it!
It was tested with a vanilla kernel 3.14.25 with the following kernel options:
i915.lvds_downclock=1 i915.semaphores=1 i915.i915_enable_rc6=7 i915.i915_enable_fbc=1 nohz=on nmi_watchdog=0 pcie_aspm=force thinkpad_acpi.force_load=1 thinkpad_acpi.brightness_enable=0 thinkpad_acpi.fan_control=1 snd-hda-intel.index=0 snd_hda_intel.power_save=10 snd_hda_intel.model=thinkpad snd-hda-intel.probe_mask=0x103 snd-pcsp.index=1 btusb.reset=1 i915.fastboot=1
I'm also using the latest libreboot without ACPI brightness (coreboot head 8ffc085e1affaabbe3dca8ac6a89346b71dfc02e with patches 6725 7048 5345 7050 7051) with CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT and CONFIG_FRAMEBUFFER_KEEP_VESA_MODE.
The first results I posted on the list were a kernel boot in about 2.2s. I should now be around 1.5s. I will prepare a static kernel and post the .config and dmesg for precise measurements in case anyone is interested in replicating the results.