#8457: Blank screen after boot on Radeon Mobility 4670 HD ------------------------------------------+---------------------------- Reporter: kvark | Owner: kallisti5 Type: bug | Status: new Priority: normal | Milestone: R1 Component: Drivers/Graphics/radeon_hd | Version: R1/Development Resolution: | Keywords: blank radeon Blocked By: | Blocking: 7662 Has a Patch: 0 | Platform: x86 ------------------------------------------+---------------------------- Comment (by kallisti5): sigh... your laptop is buggy :P Partial fix applied in hrev45812 As for the black screen... I noticed the modeline calculations were a little odd. {{{ KERN: radeon_hd: radeon_set_display_mode: pll 0 selected for connector 0 3290 KERN: radeon_hd: pll_setup_flags: CRTC: 0, PLL: 0 3291 KERN: radeon_hd: pll_setup_flags: Spread Spectrum is 8% 3292 KERN: radeon_hd: pll_setup_flags: using Spread Spectrum reference divider. refDiv was: 0, now: 98 3293 KERN: radeon_hd: pll_adjust: table 1.2 3294 KERN: radeon_hd: pll_adjust: was: 72330, now: 72330 3295 KERN: radeon_hd: pll_compute_post_divider: vco = 1200000 3296 KERN: radeon_hd: pll_compute_post_divider: postDiv = 16 3297 KERN: radeon_hd: pll_compute: using AtomBIOS reference divider 3298 KERN: radeon_hd: pll_compute: using AtomBIOS fractional feedback divider 3299 KERN: radeon_hd: pll_compute: pixel clock: 72330 gives: feedbackDivider = 2049.0; referenceDivider = 98; postDivider = 16 3300 KERN: radeon_hd: pll_compute: pixel clock 72330 was changed to 35282 3301 KERN: radeon_hd: display_crtc_ss 3302 KERN: radeon_hd: pll_set: table 1.3 3303 KERN: radeon_hd: pll_set: set adjusted pixel clock 35282 (was 72330) 3304 KERN: radeon_hd: display_crtc_set_dtd called to do 1366x768 3305 KERN: radeon_hd: display_crtc_fb_set: Framebuffer at: 0x0 3306 KERN: radeon_hd: display_crtc_fb_set: Set SurfaceAddress High: 0x0 3307 KERN: radeon_hd: display_crtc_fb_set: Set SurfaceAddress: 0x0 3308 KERN: radeon_hd: display_crtc_fb_set: fb: 1366x768 (32 bpp) 3309 KERN: radeon_hd: display_crtc_fb_set: fb pitch: 1376 3310 KERN: radeon_hd: display_crtc_fb_set: fb width aligned: 1376 }}} This is the first time i've ever seen Spread Spectrum used. The feedbackDivider is changed into something really incorrect. -- Ticket URL: <http://dev.haiku-os.org/ticket/8457#comment:42> Haiku <http://dev.haiku-os.org> Haiku - the operating system.