diff options
| -rw-r--r-- | drivers/video/neofb.c | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/drivers/video/neofb.c b/drivers/video/neofb.c index 24b12f71d5a8..2f156b724d1c 100644 --- a/drivers/video/neofb.c +++ b/drivers/video/neofb.c @@ -1333,17 +1333,22 @@ static int neofb_blank(int blank_mode, struct fb_info *info) * run "setterm -powersave powerdown" to take advantage */ struct neofb_par *par = info->par; - int seqflags, lcdflags, dpmsflags, reg; - + int seqflags, lcdflags, dpmsflags, reg, tmpdisp; /* - * Reload the value stored in the register, if sensible. It might have - * been changed via FN keystroke. + * Read back the register bits related to display configuration. They might + * have been changed underneath the driver via Fn key stroke. + */ + neoUnlock(); + tmpdisp = vga_rgfx(NULL, 0x20) & 0x03; + neoLock(&par->state); + + /* In case we blank the screen, we want to store the possibly new + * configuration in the driver. During un-blank, we re-apply this setting, + * since the LCD bit will be cleared in order to switch off the backlight. */ if (par->PanelDispCntlRegRead) { - neoUnlock(); - par->PanelDispCntlReg1 = vga_rgfx(NULL, 0x20) & 0x03; - neoLock(&par->state); + par->PanelDispCntlReg1 = tmpdisp; } par->PanelDispCntlRegRead = !blank_mode; @@ -1378,12 +1383,21 @@ static int neofb_blank(int blank_mode, struct fb_info *info) break; case FB_BLANK_NORMAL: /* just blank screen (backlight stays on) */ seqflags = VGA_SR01_SCREEN_OFF; /* Disable sequencer */ - lcdflags = par->PanelDispCntlReg1 & 0x02; /* LCD normal */ + /* + * During a blank operation with the LID shut, we might store "LCD off" + * by mistake. Due to timing issues, the BIOS may switch the lights + * back on, and we turn it back off once we "unblank". + * + * So here is an attempt to implement ">=" - if we are in the process + * of unblanking, and the LCD bit is unset in the driver but set in the + * register, we must keep it. + */ + lcdflags = ((par->PanelDispCntlReg1 | tmpdisp) & 0x02); /* LCD normal */ dpmsflags = 0x00; /* no hsync/vsync suppression */ break; case FB_BLANK_UNBLANK: /* unblank */ seqflags = 0; /* Enable sequencer */ - lcdflags = par->PanelDispCntlReg1 & 0x02; /* LCD normal */ + lcdflags = ((par->PanelDispCntlReg1 | tmpdisp) & 0x02); /* LCD normal */ dpmsflags = 0x00; /* no hsync/vsync suppression */ #ifdef CONFIG_TOSHIBA /* Do we still need this ? */ |